Patch Testing with Formaldehyde 2.0% in Parallel with 1.0% by the Swedish Contact Dermatitis Research Group
DOI:
https://doi.org/10.2340/00015555-1748Keywords:
formaldehyde, simultaneous contact allergy, baseline series, micropipette, patch test, dose mg/cm�, preservative, formaldehyde releasers.Abstract
In a multicentre study consecutively patch-tested dermatitis patients were tested simultaneously with 1.0% and 2.0% (w/v) formaldehyde in aqua applied with a micropipette (15 µl) to the filter paper disc in Finn Chambers (0.30 mg/cm(2) and 0.60 mg/cm(2), respectively). A total of 2,122 dermatitis patients were patch-tested. In all, 77 (3.6%) patients reacted positively to formaldehyde; 37 reacted only to 2.0%, 35 reacted to both concentrations and 5 patients reacted only to 1.0%. Significantly more patients were thus diagnosed with contact allergy to formaldehyde with 2.0% compared to 1.0% (p < 0.001) without causing more irritant reactions. The detected number of isolated allergic reactions to the 2 formaldehyde-releasers in the Swedish baseline series and not to formaldehyde itself raises the question whether quaternium-15 1.0% and diazolidinyl urea 2.0% should be present in the Swedish baseline series.Downloads
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Copyright (c) 2013 Marléne Isaksson, Johanna Bråred-Christensson, Malin Engfeldt, Magnus Lindberg, Mihaly Matura, Halvor Möller, Kristina Ryberg, Berndt Stenberg, Cecilia Svedman, Magnus Bruze
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